保水剂对粘质潮土团聚体分布、稳定性及玉米养分积累的影响

发布时间：2018-04-11 11:18

本文选题：保水剂 + 土壤团聚体　；参考：《水土保持学报》2017年02期

【摘要】：通过玉米盆栽试验,研究了4种不同类型保水剂对粘质潮土团聚体分布、稳定性和玉米养分积累及吸收利用的影响。结果表明:保水剂保水效果在玉米生长中后期显现,收获期各处理土壤含水量比对照提高21.45%~65.09%;通过计算5种土壤团聚体特征参数并分析其与土壤粒径组成的相关性发现,聚丙烯酸钠(WT_1)与自制有机肥型保水剂(OSC)的土壤水稳性大团聚体数量(R_(0.25))比施肥处理(T_1)显著提高72.40%和58.00%,平均重量直径(MWD)和几何平均直径(GMD)较T_1分别显著提高45.91%,67.89%和57.34%,64.11%,土壤不稳定团粒指数(E_(LT))显著降低18.51%和14.83%;各保水剂处理使分形维数(D)降低0.10%~2.64%;GMD与土壤各级颗粒含量均呈极显著相关(p0.01),较其他参数可更准确的反应土壤团聚体分布及稳定性;聚丙酰胺型保水剂(AS)和OSC对于土壤氮素的保持和促进氮素转化效果更好,籽粒含氮量比T_1分别显著上升10.37%和15.67%。OSC对提高土壤团聚体和促进养分吸收利用均具有显著效果,这对进一步研制复合功能保水剂提供了参考。
[Abstract]:The effects of four kinds of water-retaining agents on the distribution, stability, nutrient accumulation and absorption and utilization of clay soil were studied by pot experiment of maize.The results showed that the water retention effect of water retaining agent was obvious in the middle and late stage of maize growth, and the soil moisture content in each harvest period was 21.4545 ~ 65.09 higher than that of the control, and the correlation between soil moisture content and soil particle size composition was found by calculating the characteristic parameters of five kinds of soil aggregates and analyzing the correlation between them and the soil particle size composition.The index of soil unstable aggregates (ESP) decreased by 18.51% and 14.83%, and the fractal dimension (D) decreased by 0.100.10% and 2.64% (P < 0.01), which was more accurate than other parameters in reflecting the distribution and stability of soil aggregates.Poly (propionamide) and OSC had better effects on soil nitrogen conservation and nitrogen conversion. Grain nitrogen content increased by 10.37% than T _ 1 and 15.67%.OSC had significant effects on soil aggregate and nutrient uptake and utilization, respectively.This provides a reference for the further development of composite functional water-retaining agent.
【作者单位】：山东省植物营养与肥料重点实验室;山东省农业科学院农业资源与环境研究所;山东省无棣县农业局;
【基金】：山东省农业科学院青年科研基金项目(2014QNM56) 山东省粮丰工程三期项目(2013BAD07B06) 黄河三角洲盐碱地快速改良技术项目(2014ZZCX07401) 华北平原中南部旱地两熟区高强度利用退化及盐碱耕地培肥与合理农作制技术集成与示范项目(201503121-06)
【分类号】：S152;S513

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